Vitreous humor biochemistry is preferred over blood for postmortem glucose estimation in suspected hypoglycemic death. What is the primary reason?

• A Vitreous glucose does not undergo postmortem glycolysis and remains stable
• B Vitreous glucose is always higher than antemortem blood glucose
• C Vitreous is immune to bacterial fermentation and glycolysis, remaining more stable than blood glucose ✓
• D Insulin does not affect vitreous glucose levels postmortem

Explanation

Postmortem blood glucose falls rapidly due to continued glycolysis by red blood cells and bacterial fermentation, making it unreliable for antemortem glucose estimation. Vitreous humor is an avascular, immune-privileged compartment with minimal cellular activity, so glucose degradation is greatly slowed. Vitreous glucose still undergoes some decline postmortem but is far more representative of antemortem levels than blood. Option A is incorrect because some glycolysis does occur; B is incorrect — vitreous glucose is typically lower than blood glucose by about 10%; D is incorrect as insulin can still affect initial vitreous glucose through transport.

Reference: The Essentials of Forensic Medicine and Toxicology (Narayan Reddy), 34th ed.

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Written and medically reviewed by the StethoPrep medical team.